Question

化簡根式,所得的結(jié)果是（    ）

A.6y-x                                         B.3y-

C.-3y                                       D.(3y-x)

Answer 1

解析:

∵y≥,∴x≤6y,即x-6y≤0.

∴原式=-（x-6y）=3y-x.

故選B.

答案:B.